Hydraulic jack



Jam 12 1926 1,569,589

C. S. STOCKER HYDRAULI C JACK Filed July 9, 1924 2 sheetsl-sheet 1 Jan,112 1926. 1,5695% C. S. STOCKER HYDRAULIC JACK Filed July 9, 1924 2Sheets-Sheet 2 Patented .len. 12, 1926..

CHARLES S. STOCKER. OF LOS ANGELES, CALIFORNIA. ASSIGNOR TO 3'. M.BRENNAN, OF LOS ANGELES, CALIFORNIA.

HYDRAULIC JACK.

' Application filed July 9,

To (11/ will-omv ill only concern lie it known that 1, CHARLES S.S'roomcn,

amounted on casters and having a tongue,

and especially useful in garages and the like for manipulating motorvehicles.

Other objects and advantages will appear from the drawings andspecification.

The drawings illustrate the construction and operation of a hydraulicjack embodying the principles ol. my invention.

Figure 1 is a top plan view as seen looking in the direction of thearrow 1 in Fig. 2.

Fig. 2 is a side elevation looking in the direction indicated by thearrow 2 in Fig. 1.

Fig. 3 is an enlarged sectional elevation on a plane parallel with Fig.2 and on the line 3-3 of Fig. 1, and looking in the direction indicatedby the arrows.

Fig. 4 is an enlarged "fragmentary sectional detail on the line 44 ofFig. 3.

The details of coast rnct ion and operation shown in the drawings are as-l'ollows:

The main frame 1 has three equal radial arms 2, 3 and 4. Verticalhearings 5, (5 and 7 are formed at the outer ends of the arms 2, 3 and 4and the stems 8, 9 and 10 of casters 11, 12 and 13 are inserted upwardlythrough the bearings 5, 6 and 7.

The frame 1 is enlarged and extended downwardly to form a housing 14having a vertical circular central chamber 15 open at its top, anannular chamber 16 extending around the wall 17 ot' the chamber 15 and apump casing 18. The chamber 16 is entirely enclosed and a removable plug19 at the top provides means for filling the chambers 15 and 16 and mayhave an air vent 20. The chamber 15 is coimter-bored from the upper endto form a seat 21. A hydraulic cylinder 22 fits loosely in the chamber15 and has stop lugs 23 extending outwardly at its lower end. Thecylinder 22 is inserted downwardly into the chamber 15. A packingsupporting ring 24 is inserted downwardly around the cylinder 1924.Serial No. 724,970.

22 into the seat 21 and tits closely upon the cylinder 22. A packing 25is inserted downward ly into the seat 21 against the ring 24 and aretaining ring 26 is screwed into the seat 21 against the packing 25 soas to make a tight sliding joint between the cylinder 22 and the mainframe.

A second cylinder 27 tits loosely in the cylinder 22 and has retaininglugs 28 extending outwardly around its lower end. A packing supportingring 29 is inserted downwardly around the cylinder 27 into acouneter-bore"3t) ot.the cylinder 22. A packing 31 is inserted againstthe ring 29 and a retaining ring 32 is screwed into the seat 30 againstthe packing 31 so as to make atight sliding lit between the cylinders 22and 27. The stop lugs 23 will engage the ring 24 to limit the upwardn'iovement of the cylinder 22 and the sto. lugs 28 will engage the ring29 to limit t e upward movement of the cylinder 27.

In a like manner the third cylinder 33 fits loosely in the cylinder 27and has lugs 34 extending outwardly from its lower end. A counter-bore35 is formed in the upper end of the cylinder 27. A ring 36 is inserteddownwardly around the cylinder 33 into the counter-bore 35. A packing 37is inserted against the ring 36 and a retaining ring 38 is screwed intothe counter-bore 35 against the packing 37 so as to make a tight slidingjoint between the cylinder 27 and the cylinder 33 and so as to limit theupward movement of the cylinder 33. A retractile coil spring 38 connectsan eye bolt 39 at the top of the cylinder 33 to a similar e e 'bolt40 atthe bottom of the chamber 15, t e tension of the spring being exerted totelescope the cylinders 33, 27 and 22 into the chamber 15.

The annular chamber 16 is entirely separated from the chamber 15 exceptthrough ports as shown in Fig. 4. The pump casing 18 is a lug extendingfrom the housing and has .a vertical piston chamber 41. A port 42extends from the bottom of the chamber 41 to the bottom of the chamber15. The outer end of the port 42 is enlarged to form a spring seat 43, aspring 44 is placed against the seat 43, a ball 45 is placed against thespring 44, and a plug 46 is screwed into the outer end of the bore 42and has a spring seat 47 fitting against the ball 45. The plug 46 isbored longitudinally to form a passage 48 in line with the small end ofthe port 42 and the plug is bored from one side to form a continuation49 ot' the passage 48 so as to connect the chamber 41 to the chamber 15and make an inlet check valve to hold the pressure in the chamber .15.The port 42 passes through a bridge 50 at the bottom of the chamber 16.A second bridge 51 passes under the bottom of the chamber 16 and a port52 extends through the bridge 51 and a cross port 53 connects the port52 with the chamber 1.6. A valve 54 fits in the port 52 crosswise ot'the port 53 to stop the circulation from the chamber 15 to the chamber16 and so that when the valve 54 is pulled outwardly beyond the crossport 53 there is a free connection limited by the size of the port 52between the chamber 15 and the chamber 16. The outer end of the port 52is counterbored to form a chamber to receive the spring seat 55, aspring 56 is placed around the valve 54 against the spring seat 55, anda plug 57 fits around the valve 54 and is screwed into the bore againstthe spring 56. The spring seat 55 may be a pin inserted through thevalve 54 so as to connect the spring 56 to the valve. A port 58 leadsfrom the bottom of the chamber 41 to a port' 59 leading into the chamber16. A part of the ort 59 is enlarged to form a seat for the all valve 60and a spring 61 is placed against the ball and the plug 62 screwed intothe outer end of the enlarged bore.

A piston 63 operates in the chamber 41 and when the piston 63 is movedupwardly oil or other suitable fluid will-be sucked from the chamber 16past the check valve 60 into the chamber 41 and when the piston 63 ismoved downwardly the check valve 60 will hold and the oil will pass thecheck valve 45 into the chamber 15.

Arms 64 and 65 extend from the main frame 1. A bell crank lever 66 ismounted between the outer ends of the arms 64 and 65 upon the pivot pin67 and one end of the lever is bifurcated to straddle the upper end ofthe piston 63 and a pin 68 is fixed through the upper end of the piston63 and operates in slots 69 formed transversely through the bifurcationsof the lever 66, so that when the bell crank lever 66 is rocked upon thepivots 67 the piston 63 is operated.

A tongue 70 has a head 71 with bearings 72 and 73 fitting upon the outerends of the pivots 67. A hand lever 74 is connected to the outer end ofthe tongue 7 O by a pivot 75 and a link 76 connects the hand lever 74 tothe lower arms of the bell crank lever 66 so that when the hand lever 74is manually operated back and forth the piston 63 is operated. A cord 77connects an eye bolt 78 upon the handle 70 to the eye 79 upon the. valve54 so that when the cord 77 is pulled the valve 54 moves outwardly pastthe port 53 and so that when the cord 77 is released the spring 56 willreturn the valve 54 to a position crosswise of the port 53.

In the practical operation, the chambers 15 and 16 are filled with oilor other suitable liquid to the desired extent,'and the cylinders 22, 27and 33 are normally telescoped' into the chamber 15. By manipulating thetongue 70 the jack may be placed in any suitable position, as under avehicle axle. Then the hand lever74 is manually operated to pump oilfrom the chamber 16 into the chamber 15 and raise the cylinders 22, 27and 33 .to raise the load to the desired extent. When it is desired tolower the load and remove the jack the cord 77 is pulled to operate thevalve 54 and allow the oil in the chamber 15 to run back into thechamber 16. The spring 38 will assist in pulling the cylinders 33, 27and 22 downwardly and force the oil to circulate through the port to thechamber 16.

Various changesmay be made without departing from the spirit of theinvention as claimed.

I claim:

A hydraulic jack comprising a main frame mounted on casters and having acentral housing forming a central chamber open at the top and an annularenclosed chamber around the central chamber, a tongue pivotallyconnected to .the frame, a bell crank lever mounted upon the pivot, apump cylinder, a piston in the pump cylinder and connected to thebellcrank lever, a hand lever mounted upon the free end of the tongue, alink connecting thehand lever to the bell crank lever, means formingconnections between the central chamber, the annular chamber and thepump cylinder so as to pump a liquid from the annular chamber to thecentral chamber, a plurality of telescoping cylinders mounted in thecentral chamber and adapted to be raised by the fluid pumped into thecentral chamber, and there being means for allowing thefluid to flowback from the central chamber to the annular chamber and allow thecylinders to descend.

In testimony whereof I have signed my name to this specification.

CHARLES s. STOCKER.

